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use std::fs::{File, OpenOptions};
use std::io::{Read, Write, Seek, SeekFrom};
use redoxfs::Disk;
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macro_rules! try_disk {
($expr:expr) => (match $expr {
Ok(val) => val,
Err(err) => {
println!("Disk I/O Error: {}", err);
return Err(Error::new(EIO));
}
})
}
pub struct Image {
file: File
}
impl Image {
pub fn open(path: &str) -> Result<Image> {
let file = try_disk!(OpenOptions::new().read(true).write(true).open(path));
Ok(Image {
file: file
})
}
pub fn create(path: &str, size: u64) -> Result<Image> {
let file = try_disk!(OpenOptions::new().read(true).write(true).create(true).open(path));
try_disk!(file.set_len(size));
Ok(Image {
file: file
})
}
}
impl Disk for Image {
fn read_at(&mut self, block: u64, buffer: &mut [u8]) -> Result<usize> {
try_disk!(self.file.seek(SeekFrom::Start(block * 512)));
let count = try_disk!(self.file.read(buffer));
Ok(count)
}
fn write_at(&mut self, block: u64, buffer: &[u8]) -> Result<usize> {
try_disk!(self.file.seek(SeekFrom::Start(block * 512)));
let count = try_disk!(self.file.write(buffer));
Ok(count)
}
fn size(&mut self) -> Result<u64> {
let size = try_disk!(self.file.seek(SeekFrom::End(0)));
Ok(size)
}
}